Hello everyone, i was working on multiple XSS labs on HTB Academy and portswigger academy and i was wondering how i can improve my " code reviewing skills " to find XSS. Because i saw payloads like this one :
'><hTmL/+/oNmouseoVeR%0a=%0aa=prompt,a()%0dx>
And i was wondering how you can find this type of thing manually, how i can learn to craft efficient payloads by hand 
( in any programming languages )
Thanks to anyone who can help me to understand more about this ^^